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Energy cannot be created or destroyed. It can be transformed into different forms and moved from one part of the world to another. But if you add up all the different forms (making sure you haven’t missed anything), the total amount of energy never changes.

Money goes in and out of accounts, for many different purposes: payment for supplies, purchases by customers, salaries paid, etc.

No matter how many transfers occur, someone always has the money – in one of the accounts, or in their pocket. If it appears to have been lost, there’s just an account (or pocket!) we don’t know about.

“It is important to realize that in physics today, we have no knowledge of what energy is.…There are formulas for calculating some numerical quantity, and when we add it all together it gives…always the same number. It is an abstract thing in that it does not tell us the mechanism or the reasons for the various formulas.”